Charles e



UNITED STATES PATENT OEEICE.

CHARLES E. POLLARD, OF MIDDLETOVN, CONNECTICUT, ASSIGNOR OF ONE-HALF TO EDMUND S. STILES, OF SAME PLACE.

MACHINISTS BLOCKING.

SPECIFICATION forming part of Letters Patent No. 399,926, dated March 19, 1889.

Application filed February ll, 1889. Serial No. 299,359. (No model.)

To all whom it may concern:

Be it known that I, CHARLES PQLLARD, of Middletown, in the county of Middlesex and State of Connecticut, have invented a new Improvement in MachinistsBlocking; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters ot' reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure l, a side View of the blocking complete; Fig. 2, a vertical section on line :t a; of Fig. 3; Fig. 3, a horizontal section on line @c @c of Fig. 2; Fig. 4, a vertical section of the base, showing side View of the slide without the adj Listing-screw; Fig. 5, a vertical central sec tion showing a modification.

This invention relates to an improvement in the construction of blocking such as used by machinists for blocking their work upon planers and other machines, the object being to produce a blocking which is easily adjusted to various lengths or elevations, and which shall be iirm as a solid blocking1 when once set; and the invention consists in the construction, as hereinafter' described, and particularly recited in the claims.

A represents the base or body of the block, which is preferablymade of rectangular shape in horizontal section, and with an opening vertically through it. One side of the opening is serrated, toothed, or otherwise roughened, as at a.. Vithin this base a vertical slide, B, is arranged, which is serrated, toothed, or roughened upon one side, correspending to the like serrated portion of the base, and as at b, so that the seri-ations of the slide B may engage the serrations in the base, as clearly seen in Fig. 2. The slide B transversely lls the base, but is less in width from the toothed side to the opposite side than the opening through the base, and so that when the teeth are engaged, as seen in Fig. 2, a space, d, will be left between the back of the slide and the adjacent wall of the opening. The width of this space d is at least equal to the depth of the serrations or engaging teeth of the slide and base, and so that the slide may be drawn out of engagement with the base, as indicated in broken lines, Fig. 2, and in which position tlie slide is free to be raised or lowered, as may be desirable. Through the base, opposite the serrations, a set-screw, C, is introduced to bear against the back of the slide B, and so as to force and hold the .teeth on the tace of the slide into engagement with the corresponding teeth of the base, and as s een in Fig. 2, the screw being withdrawn for the disengagement of the slide from the base. In seating the blocking the screw is withdrawn and. the slide adjusted to the required elevation, and the screw reset to hold the slide as irm as if an integral part of the base.

At times a nicer adjustment is desirable than can be at tained by the serrations or teeth of the slide. To provide for such nice adjustment, I introduce a screw, D, vertically into the top of the slide, with a nut, E, on the screw to take a bearing on the top of the slide, and so that by rotating the nut the screw may be elevated or depressed accordingly, the head of the screw forming the bearing-point for the blocking. Thus the nicest adjustment may be attained. The adjusting-screw, however, may be omitted, as seen in Fig. 4.

Instead of the screw, a second slide, F, may be introduced through a corresponding opening in the slide B, as seen in Fig. 5, the slide B being provided with a set-screw, if, to hold the slide F in engagement with the slide B. The teeth between the slide F and slide B, being of different pitch from that between the slide B and the base, will permit of a nice adjustment.

I do not wish to be understood as claiming, broadly, an adjustable blocking for machinists or other uses, as such I am aware is not new, and I am also aware that such blockingl has been constructed with the adjustable portion and-the base correspondingly serrated.

Vhat I claim is- A l. The combination of the base having an opening vertically through it, one wall of the base roughened, a set-screw through Vthe opposite wall of the base, a slide arranged in the opening of the base, its tace roughened corresponding to the roughcned surface of the base, the saidset-scrcw arranged to bear upon IOO the back of the base and ho1d the roughened surfaces of the base and slide in engagement, the width of the slide being less than the distance between the face and screw side of the opening in the base, substantially as described.

2. The combination of the base A, having an opening vertically through it, one wall of the opening roughened, a set-screw, C, through the opposite Wall, a slide, B, arranged in the opening of the base, its face roughened corresponding to the roughened surface of the base, a screw arranged to bear upon the back of said slide to engage the base and slide, the slide less in Width from its roughened surface to the back than the corresponding Width of the opening in the base, and ay screw, D, adjustably set into the upper end of the slide B, substantially as described.

CHARLES E. POLLARD.

Witnesses:

EDMUND S. STILEs, RoB'r. J. Gool). 

